xref: /linux/drivers/hwmon/gl518sm.c (revision 621cde16e49b3ecf7d59a8106a20aaebfb4a59a9)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * gl518sm.c - Part of lm_sensors, Linux kernel modules for hardware
4  *             monitoring
5  * Copyright (C) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and
6  * Kyosti Malkki <kmalkki@cc.hut.fi>
7  * Copyright (C) 2004 Hong-Gunn Chew <hglinux@gunnet.org> and
8  * Jean Delvare <jdelvare@suse.de>
9  *
10  * Ported to Linux 2.6 by Hong-Gunn Chew with the help of Jean Delvare
11  * and advice of Greg Kroah-Hartman.
12  *
13  * Notes about the port:
14  * Release 0x00 of the GL518SM chipset doesn't support reading of in0,
15  * in1 nor in2. The original driver had an ugly workaround to get them
16  * anyway (changing limits and watching alarms trigger and wear off).
17  * We did not keep that part of the original driver in the Linux 2.6
18  * version, since it was making the driver significantly more complex
19  * with no real benefit.
20  */
21 
22 #include <linux/module.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/jiffies.h>
26 #include <linux/i2c.h>
27 #include <linux/hwmon.h>
28 #include <linux/hwmon-sysfs.h>
29 #include <linux/err.h>
30 #include <linux/mutex.h>
31 #include <linux/sysfs.h>
32 
33 /* Addresses to scan */
34 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, I2C_CLIENT_END };
35 
36 enum chips { gl518sm_r00, gl518sm_r80 };
37 
38 /* Many GL518 constants specified below */
39 
40 /* The GL518 registers */
41 #define GL518_REG_CHIP_ID	0x00
42 #define GL518_REG_REVISION	0x01
43 #define GL518_REG_VENDOR_ID	0x02
44 #define GL518_REG_CONF		0x03
45 #define GL518_REG_TEMP_IN	0x04
46 #define GL518_REG_TEMP_MAX	0x05
47 #define GL518_REG_TEMP_HYST	0x06
48 #define GL518_REG_FAN_COUNT	0x07
49 #define GL518_REG_FAN_LIMIT	0x08
50 #define GL518_REG_VIN1_LIMIT	0x09
51 #define GL518_REG_VIN2_LIMIT	0x0a
52 #define GL518_REG_VIN3_LIMIT	0x0b
53 #define GL518_REG_VDD_LIMIT	0x0c
54 #define GL518_REG_VIN3		0x0d
55 #define GL518_REG_MISC		0x0f
56 #define GL518_REG_ALARM		0x10
57 #define GL518_REG_MASK		0x11
58 #define GL518_REG_INT		0x12
59 #define GL518_REG_VIN2		0x13
60 #define GL518_REG_VIN1		0x14
61 #define GL518_REG_VDD		0x15
62 
63 
64 /*
65  * Conversions. Rounding and limit checking is only done on the TO_REG
66  * variants. Note that you should be a bit careful with which arguments
67  * these macros are called: arguments may be evaluated more than once.
68  * Fixing this is just not worth it.
69  */
70 
71 #define RAW_FROM_REG(val)	val
72 
73 #define BOOL_FROM_REG(val)	((val) ? 0 : 1)
74 #define BOOL_TO_REG(val)	((val) ? 0 : 1)
75 
76 #define TEMP_CLAMP(val)		clamp_val(val, -119000, 136000)
77 #define TEMP_TO_REG(val)	(DIV_ROUND_CLOSEST(TEMP_CLAMP(val), 1000) + 119)
78 #define TEMP_FROM_REG(val)	(((val) - 119) * 1000)
79 
FAN_TO_REG(long rpm,int div)80 static inline u8 FAN_TO_REG(long rpm, int div)
81 {
82 	long rpmdiv;
83 	if (rpm == 0)
84 		return 0;
85 	rpmdiv = clamp_val(rpm, 1, 960000) * div;
86 	return clamp_val((480000 + rpmdiv / 2) / rpmdiv, 1, 255);
87 }
88 #define FAN_FROM_REG(val, div)	((val) == 0 ? 0 : (480000 / ((val) * (div))))
89 
90 #define IN_CLAMP(val)		clamp_val(val, 0, 255 * 19)
91 #define IN_TO_REG(val)		DIV_ROUND_CLOSEST(IN_CLAMP(val), 19)
92 #define IN_FROM_REG(val)	((val) * 19)
93 
94 #define VDD_CLAMP(val)		clamp_val(val, 0, 255 * 95 / 4)
95 #define VDD_TO_REG(val)		DIV_ROUND_CLOSEST(VDD_CLAMP(val) * 4, 95)
96 #define VDD_FROM_REG(val)	DIV_ROUND_CLOSEST((val) * 95, 4)
97 
98 #define DIV_FROM_REG(val)	(1 << (val))
99 
100 #define BEEP_MASK_TO_REG(val)	((val) & 0x7f & data->alarm_mask)
101 #define BEEP_MASK_FROM_REG(val)	((val) & 0x7f)
102 
103 /* Each client has this additional data */
104 struct gl518_data {
105 	struct i2c_client *client;
106 	const struct attribute_group *groups[3];
107 	enum chips type;
108 
109 	struct mutex update_lock;
110 	bool valid;		/* true if following fields are valid */
111 	unsigned long last_updated;	/* In jiffies */
112 
113 	u8 voltage_in[4];	/* Register values; [0] = VDD */
114 	u8 voltage_min[4];	/* Register values; [0] = VDD */
115 	u8 voltage_max[4];	/* Register values; [0] = VDD */
116 	u8 fan_in[2];
117 	u8 fan_min[2];
118 	u8 fan_div[2];		/* Register encoding, shifted right */
119 	u8 fan_auto1;		/* Boolean */
120 	u8 temp_in;		/* Register values */
121 	u8 temp_max;		/* Register values */
122 	u8 temp_hyst;		/* Register values */
123 	u8 alarms;		/* Register value */
124 	u8 alarm_mask;
125 	u8 beep_mask;		/* Register value */
126 	u8 beep_enable;		/* Boolean */
127 };
128 
129 /*
130  * Registers 0x07 to 0x0c are word-sized, others are byte-sized
131  * GL518 uses a high-byte first convention, which is exactly opposite to
132  * the SMBus standard.
133  */
gl518_read_value(struct i2c_client * client,u8 reg)134 static int gl518_read_value(struct i2c_client *client, u8 reg)
135 {
136 	if ((reg >= 0x07) && (reg <= 0x0c))
137 		return i2c_smbus_read_word_swapped(client, reg);
138 	else
139 		return i2c_smbus_read_byte_data(client, reg);
140 }
141 
gl518_write_value(struct i2c_client * client,u8 reg,u16 value)142 static int gl518_write_value(struct i2c_client *client, u8 reg, u16 value)
143 {
144 	if ((reg >= 0x07) && (reg <= 0x0c))
145 		return i2c_smbus_write_word_swapped(client, reg, value);
146 	else
147 		return i2c_smbus_write_byte_data(client, reg, value);
148 }
149 
gl518_update_device(struct device * dev)150 static struct gl518_data *gl518_update_device(struct device *dev)
151 {
152 	struct gl518_data *data = dev_get_drvdata(dev);
153 	struct i2c_client *client = data->client;
154 	int val;
155 
156 	mutex_lock(&data->update_lock);
157 
158 	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
159 	    || !data->valid) {
160 		dev_dbg(&client->dev, "Starting gl518 update\n");
161 
162 		data->alarms = gl518_read_value(client, GL518_REG_INT);
163 		data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
164 
165 		val = gl518_read_value(client, GL518_REG_VDD_LIMIT);
166 		data->voltage_min[0] = val & 0xff;
167 		data->voltage_max[0] = (val >> 8) & 0xff;
168 		val = gl518_read_value(client, GL518_REG_VIN1_LIMIT);
169 		data->voltage_min[1] = val & 0xff;
170 		data->voltage_max[1] = (val >> 8) & 0xff;
171 		val = gl518_read_value(client, GL518_REG_VIN2_LIMIT);
172 		data->voltage_min[2] = val & 0xff;
173 		data->voltage_max[2] = (val >> 8) & 0xff;
174 		val = gl518_read_value(client, GL518_REG_VIN3_LIMIT);
175 		data->voltage_min[3] = val & 0xff;
176 		data->voltage_max[3] = (val >> 8) & 0xff;
177 
178 		val = gl518_read_value(client, GL518_REG_FAN_COUNT);
179 		data->fan_in[0] = (val >> 8) & 0xff;
180 		data->fan_in[1] = val & 0xff;
181 
182 		val = gl518_read_value(client, GL518_REG_FAN_LIMIT);
183 		data->fan_min[0] = (val >> 8) & 0xff;
184 		data->fan_min[1] = val & 0xff;
185 
186 		data->temp_in = gl518_read_value(client, GL518_REG_TEMP_IN);
187 		data->temp_max =
188 		    gl518_read_value(client, GL518_REG_TEMP_MAX);
189 		data->temp_hyst =
190 		    gl518_read_value(client, GL518_REG_TEMP_HYST);
191 
192 		val = gl518_read_value(client, GL518_REG_MISC);
193 		data->fan_div[0] = (val >> 6) & 0x03;
194 		data->fan_div[1] = (val >> 4) & 0x03;
195 		data->fan_auto1  = (val >> 3) & 0x01;
196 
197 		data->alarms &= data->alarm_mask;
198 
199 		val = gl518_read_value(client, GL518_REG_CONF);
200 		data->beep_enable = (val >> 2) & 1;
201 
202 		if (data->type != gl518sm_r00) {
203 			data->voltage_in[0] =
204 			    gl518_read_value(client, GL518_REG_VDD);
205 			data->voltage_in[1] =
206 			    gl518_read_value(client, GL518_REG_VIN1);
207 			data->voltage_in[2] =
208 			    gl518_read_value(client, GL518_REG_VIN2);
209 		}
210 		data->voltage_in[3] =
211 		    gl518_read_value(client, GL518_REG_VIN3);
212 
213 		data->last_updated = jiffies;
214 		data->valid = true;
215 	}
216 
217 	mutex_unlock(&data->update_lock);
218 
219 	return data;
220 }
221 
222 /*
223  * Sysfs stuff
224  */
225 
226 #define show(type, suffix, value)					\
227 static ssize_t show_##suffix(struct device *dev,			\
228 			     struct device_attribute *attr, char *buf)	\
229 {									\
230 	struct gl518_data *data = gl518_update_device(dev);		\
231 	return sprintf(buf, "%d\n", type##_FROM_REG(data->value));	\
232 }
233 
234 show(TEMP, temp_input1, temp_in);
235 show(TEMP, temp_max1, temp_max);
236 show(TEMP, temp_hyst1, temp_hyst);
237 show(BOOL, fan_auto1, fan_auto1);
238 show(VDD, in_input0, voltage_in[0]);
239 show(IN, in_input1, voltage_in[1]);
240 show(IN, in_input2, voltage_in[2]);
241 show(IN, in_input3, voltage_in[3]);
242 show(VDD, in_min0, voltage_min[0]);
243 show(IN, in_min1, voltage_min[1]);
244 show(IN, in_min2, voltage_min[2]);
245 show(IN, in_min3, voltage_min[3]);
246 show(VDD, in_max0, voltage_max[0]);
247 show(IN, in_max1, voltage_max[1]);
248 show(IN, in_max2, voltage_max[2]);
249 show(IN, in_max3, voltage_max[3]);
250 show(RAW, alarms, alarms);
251 show(BOOL, beep_enable, beep_enable);
252 show(BEEP_MASK, beep_mask, beep_mask);
253 
fan_input_show(struct device * dev,struct device_attribute * attr,char * buf)254 static ssize_t fan_input_show(struct device *dev,
255 			      struct device_attribute *attr, char *buf)
256 {
257 	int nr = to_sensor_dev_attr(attr)->index;
258 	struct gl518_data *data = gl518_update_device(dev);
259 	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_in[nr],
260 					DIV_FROM_REG(data->fan_div[nr])));
261 }
262 
fan_min_show(struct device * dev,struct device_attribute * attr,char * buf)263 static ssize_t fan_min_show(struct device *dev, struct device_attribute *attr,
264 			    char *buf)
265 {
266 	int nr = to_sensor_dev_attr(attr)->index;
267 	struct gl518_data *data = gl518_update_device(dev);
268 	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
269 					DIV_FROM_REG(data->fan_div[nr])));
270 }
271 
fan_div_show(struct device * dev,struct device_attribute * attr,char * buf)272 static ssize_t fan_div_show(struct device *dev, struct device_attribute *attr,
273 			    char *buf)
274 {
275 	int nr = to_sensor_dev_attr(attr)->index;
276 	struct gl518_data *data = gl518_update_device(dev);
277 	return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
278 }
279 
280 #define set(type, suffix, value, reg)					\
281 static ssize_t set_##suffix(struct device *dev,				\
282 			    struct device_attribute *attr,		\
283 			    const char *buf, size_t count)		\
284 {									\
285 	struct gl518_data *data = dev_get_drvdata(dev);			\
286 	struct i2c_client *client = data->client;			\
287 	long val;							\
288 	int err = kstrtol(buf, 10, &val);				\
289 	if (err)							\
290 		return err;						\
291 									\
292 	mutex_lock(&data->update_lock);					\
293 	data->value = type##_TO_REG(val);				\
294 	gl518_write_value(client, reg, data->value);			\
295 	mutex_unlock(&data->update_lock);				\
296 	return count;							\
297 }
298 
299 #define set_bits(type, suffix, value, reg, mask, shift)			\
300 static ssize_t set_##suffix(struct device *dev,				\
301 			    struct device_attribute *attr,		\
302 			    const char *buf, size_t count)		\
303 {									\
304 	struct gl518_data *data = dev_get_drvdata(dev);			\
305 	struct i2c_client *client = data->client;			\
306 	int regvalue;							\
307 	unsigned long val;						\
308 	int err = kstrtoul(buf, 10, &val);				\
309 	if (err)							\
310 		return err;						\
311 									\
312 	mutex_lock(&data->update_lock);					\
313 	regvalue = gl518_read_value(client, reg);			\
314 	data->value = type##_TO_REG(val);				\
315 	regvalue = (regvalue & ~mask) | (data->value << shift);		\
316 	gl518_write_value(client, reg, regvalue);			\
317 	mutex_unlock(&data->update_lock);				\
318 	return count;							\
319 }
320 
321 #define set_low(type, suffix, value, reg)				\
322 	set_bits(type, suffix, value, reg, 0x00ff, 0)
323 #define set_high(type, suffix, value, reg)				\
324 	set_bits(type, suffix, value, reg, 0xff00, 8)
325 
326 set(TEMP, temp_max1, temp_max, GL518_REG_TEMP_MAX);
327 set(TEMP, temp_hyst1, temp_hyst, GL518_REG_TEMP_HYST);
328 set_bits(BOOL, fan_auto1, fan_auto1, GL518_REG_MISC, 0x08, 3);
329 set_low(VDD, in_min0, voltage_min[0], GL518_REG_VDD_LIMIT);
330 set_low(IN, in_min1, voltage_min[1], GL518_REG_VIN1_LIMIT);
331 set_low(IN, in_min2, voltage_min[2], GL518_REG_VIN2_LIMIT);
332 set_low(IN, in_min3, voltage_min[3], GL518_REG_VIN3_LIMIT);
333 set_high(VDD, in_max0, voltage_max[0], GL518_REG_VDD_LIMIT);
334 set_high(IN, in_max1, voltage_max[1], GL518_REG_VIN1_LIMIT);
335 set_high(IN, in_max2, voltage_max[2], GL518_REG_VIN2_LIMIT);
336 set_high(IN, in_max3, voltage_max[3], GL518_REG_VIN3_LIMIT);
337 set_bits(BOOL, beep_enable, beep_enable, GL518_REG_CONF, 0x04, 2);
338 set(BEEP_MASK, beep_mask, beep_mask, GL518_REG_ALARM);
339 
fan_min_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)340 static ssize_t fan_min_store(struct device *dev,
341 			     struct device_attribute *attr, const char *buf,
342 			     size_t count)
343 {
344 	struct gl518_data *data = dev_get_drvdata(dev);
345 	struct i2c_client *client = data->client;
346 	int nr = to_sensor_dev_attr(attr)->index;
347 	int regvalue;
348 	unsigned long val;
349 	int err;
350 
351 	err = kstrtoul(buf, 10, &val);
352 	if (err)
353 		return err;
354 
355 	mutex_lock(&data->update_lock);
356 	regvalue = gl518_read_value(client, GL518_REG_FAN_LIMIT);
357 	data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
358 	regvalue = (regvalue & (0xff << (8 * nr)))
359 		 | (data->fan_min[nr] << (8 * (1 - nr)));
360 	gl518_write_value(client, GL518_REG_FAN_LIMIT, regvalue);
361 
362 	data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
363 	if (data->fan_min[nr] == 0)
364 		data->alarm_mask &= ~(0x20 << nr);
365 	else
366 		data->alarm_mask |= (0x20 << nr);
367 	data->beep_mask &= data->alarm_mask;
368 	gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
369 
370 	mutex_unlock(&data->update_lock);
371 	return count;
372 }
373 
fan_div_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)374 static ssize_t fan_div_store(struct device *dev,
375 			     struct device_attribute *attr, const char *buf,
376 			     size_t count)
377 {
378 	struct gl518_data *data = dev_get_drvdata(dev);
379 	struct i2c_client *client = data->client;
380 	int nr = to_sensor_dev_attr(attr)->index;
381 	int regvalue;
382 	unsigned long val;
383 	int err;
384 
385 	err = kstrtoul(buf, 10, &val);
386 	if (err)
387 		return err;
388 
389 	switch (val) {
390 	case 1:
391 		val = 0;
392 		break;
393 	case 2:
394 		val = 1;
395 		break;
396 	case 4:
397 		val = 2;
398 		break;
399 	case 8:
400 		val = 3;
401 		break;
402 	default:
403 		dev_err(dev,
404 			"Invalid fan clock divider %lu, choose one of 1, 2, 4 or 8\n",
405 			val);
406 		return -EINVAL;
407 	}
408 
409 	mutex_lock(&data->update_lock);
410 	regvalue = gl518_read_value(client, GL518_REG_MISC);
411 	data->fan_div[nr] = val;
412 	regvalue = (regvalue & ~(0xc0 >> (2 * nr)))
413 		 | (data->fan_div[nr] << (6 - 2 * nr));
414 	gl518_write_value(client, GL518_REG_MISC, regvalue);
415 	mutex_unlock(&data->update_lock);
416 	return count;
417 }
418 
419 static DEVICE_ATTR(temp1_input, 0444, show_temp_input1, NULL);
420 static DEVICE_ATTR(temp1_max, 0644, show_temp_max1, set_temp_max1);
421 static DEVICE_ATTR(temp1_max_hyst, 0644,
422 		   show_temp_hyst1, set_temp_hyst1);
423 static DEVICE_ATTR(fan1_auto, 0644, show_fan_auto1, set_fan_auto1);
424 static SENSOR_DEVICE_ATTR_RO(fan1_input, fan_input, 0);
425 static SENSOR_DEVICE_ATTR_RO(fan2_input, fan_input, 1);
426 static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0);
427 static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1);
428 static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0);
429 static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1);
430 static DEVICE_ATTR(in0_input, 0444, show_in_input0, NULL);
431 static DEVICE_ATTR(in1_input, 0444, show_in_input1, NULL);
432 static DEVICE_ATTR(in2_input, 0444, show_in_input2, NULL);
433 static DEVICE_ATTR(in3_input, 0444, show_in_input3, NULL);
434 static DEVICE_ATTR(in0_min, 0644, show_in_min0, set_in_min0);
435 static DEVICE_ATTR(in1_min, 0644, show_in_min1, set_in_min1);
436 static DEVICE_ATTR(in2_min, 0644, show_in_min2, set_in_min2);
437 static DEVICE_ATTR(in3_min, 0644, show_in_min3, set_in_min3);
438 static DEVICE_ATTR(in0_max, 0644, show_in_max0, set_in_max0);
439 static DEVICE_ATTR(in1_max, 0644, show_in_max1, set_in_max1);
440 static DEVICE_ATTR(in2_max, 0644, show_in_max2, set_in_max2);
441 static DEVICE_ATTR(in3_max, 0644, show_in_max3, set_in_max3);
442 static DEVICE_ATTR(alarms, 0444, show_alarms, NULL);
443 static DEVICE_ATTR(beep_enable, 0644,
444 		   show_beep_enable, set_beep_enable);
445 static DEVICE_ATTR(beep_mask, 0644,
446 		   show_beep_mask, set_beep_mask);
447 
alarm_show(struct device * dev,struct device_attribute * attr,char * buf)448 static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
449 			  char *buf)
450 {
451 	int bitnr = to_sensor_dev_attr(attr)->index;
452 	struct gl518_data *data = gl518_update_device(dev);
453 	return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
454 }
455 
456 static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0);
457 static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1);
458 static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2);
459 static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3);
460 static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 4);
461 static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 5);
462 static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 6);
463 
beep_show(struct device * dev,struct device_attribute * attr,char * buf)464 static ssize_t beep_show(struct device *dev, struct device_attribute *attr,
465 			 char *buf)
466 {
467 	int bitnr = to_sensor_dev_attr(attr)->index;
468 	struct gl518_data *data = gl518_update_device(dev);
469 	return sprintf(buf, "%u\n", (data->beep_mask >> bitnr) & 1);
470 }
471 
beep_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)472 static ssize_t beep_store(struct device *dev, struct device_attribute *attr,
473 			  const char *buf, size_t count)
474 {
475 	struct gl518_data *data = dev_get_drvdata(dev);
476 	struct i2c_client *client = data->client;
477 	int bitnr = to_sensor_dev_attr(attr)->index;
478 	unsigned long bit;
479 	int err;
480 
481 	err = kstrtoul(buf, 10, &bit);
482 	if (err)
483 		return err;
484 
485 	if (bit & ~1)
486 		return -EINVAL;
487 
488 	mutex_lock(&data->update_lock);
489 	data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
490 	if (bit)
491 		data->beep_mask |= (1 << bitnr);
492 	else
493 		data->beep_mask &= ~(1 << bitnr);
494 	gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
495 	mutex_unlock(&data->update_lock);
496 	return count;
497 }
498 
499 static SENSOR_DEVICE_ATTR_RW(in0_beep, beep, 0);
500 static SENSOR_DEVICE_ATTR_RW(in1_beep, beep, 1);
501 static SENSOR_DEVICE_ATTR_RW(in2_beep, beep, 2);
502 static SENSOR_DEVICE_ATTR_RW(in3_beep, beep, 3);
503 static SENSOR_DEVICE_ATTR_RW(temp1_beep, beep, 4);
504 static SENSOR_DEVICE_ATTR_RW(fan1_beep, beep, 5);
505 static SENSOR_DEVICE_ATTR_RW(fan2_beep, beep, 6);
506 
507 static struct attribute *gl518_attributes[] = {
508 	&dev_attr_in3_input.attr,
509 	&dev_attr_in0_min.attr,
510 	&dev_attr_in1_min.attr,
511 	&dev_attr_in2_min.attr,
512 	&dev_attr_in3_min.attr,
513 	&dev_attr_in0_max.attr,
514 	&dev_attr_in1_max.attr,
515 	&dev_attr_in2_max.attr,
516 	&dev_attr_in3_max.attr,
517 	&sensor_dev_attr_in0_alarm.dev_attr.attr,
518 	&sensor_dev_attr_in1_alarm.dev_attr.attr,
519 	&sensor_dev_attr_in2_alarm.dev_attr.attr,
520 	&sensor_dev_attr_in3_alarm.dev_attr.attr,
521 	&sensor_dev_attr_in0_beep.dev_attr.attr,
522 	&sensor_dev_attr_in1_beep.dev_attr.attr,
523 	&sensor_dev_attr_in2_beep.dev_attr.attr,
524 	&sensor_dev_attr_in3_beep.dev_attr.attr,
525 
526 	&dev_attr_fan1_auto.attr,
527 	&sensor_dev_attr_fan1_input.dev_attr.attr,
528 	&sensor_dev_attr_fan2_input.dev_attr.attr,
529 	&sensor_dev_attr_fan1_min.dev_attr.attr,
530 	&sensor_dev_attr_fan2_min.dev_attr.attr,
531 	&sensor_dev_attr_fan1_div.dev_attr.attr,
532 	&sensor_dev_attr_fan2_div.dev_attr.attr,
533 	&sensor_dev_attr_fan1_alarm.dev_attr.attr,
534 	&sensor_dev_attr_fan2_alarm.dev_attr.attr,
535 	&sensor_dev_attr_fan1_beep.dev_attr.attr,
536 	&sensor_dev_attr_fan2_beep.dev_attr.attr,
537 
538 	&dev_attr_temp1_input.attr,
539 	&dev_attr_temp1_max.attr,
540 	&dev_attr_temp1_max_hyst.attr,
541 	&sensor_dev_attr_temp1_alarm.dev_attr.attr,
542 	&sensor_dev_attr_temp1_beep.dev_attr.attr,
543 
544 	&dev_attr_alarms.attr,
545 	&dev_attr_beep_enable.attr,
546 	&dev_attr_beep_mask.attr,
547 	NULL
548 };
549 
550 static const struct attribute_group gl518_group = {
551 	.attrs = gl518_attributes,
552 };
553 
554 static struct attribute *gl518_attributes_r80[] = {
555 	&dev_attr_in0_input.attr,
556 	&dev_attr_in1_input.attr,
557 	&dev_attr_in2_input.attr,
558 	NULL
559 };
560 
561 static const struct attribute_group gl518_group_r80 = {
562 	.attrs = gl518_attributes_r80,
563 };
564 
565 /*
566  * Real code
567  */
568 
569 /* Return 0 if detection is successful, -ENODEV otherwise */
gl518_detect(struct i2c_client * client,struct i2c_board_info * info)570 static int gl518_detect(struct i2c_client *client, struct i2c_board_info *info)
571 {
572 	struct i2c_adapter *adapter = client->adapter;
573 	int rev;
574 
575 	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
576 				     I2C_FUNC_SMBUS_WORD_DATA))
577 		return -ENODEV;
578 
579 	/* Now, we do the remaining detection. */
580 	if ((gl518_read_value(client, GL518_REG_CHIP_ID) != 0x80)
581 	 || (gl518_read_value(client, GL518_REG_CONF) & 0x80))
582 		return -ENODEV;
583 
584 	/* Determine the chip type. */
585 	rev = gl518_read_value(client, GL518_REG_REVISION);
586 	if (rev != 0x00 && rev != 0x80)
587 		return -ENODEV;
588 
589 	strscpy(info->type, "gl518sm", I2C_NAME_SIZE);
590 
591 	return 0;
592 }
593 
594 /*
595  * Called when we have found a new GL518SM.
596  * Note that we preserve D4:NoFan2 and D2:beep_enable.
597  */
gl518_init_client(struct i2c_client * client)598 static void gl518_init_client(struct i2c_client *client)
599 {
600 	/* Make sure we leave D7:Reset untouched */
601 	u8 regvalue = gl518_read_value(client, GL518_REG_CONF) & 0x7f;
602 
603 	/* Comparator mode (D3=0), standby mode (D6=0) */
604 	gl518_write_value(client, GL518_REG_CONF, (regvalue &= 0x37));
605 
606 	/* Never interrupts */
607 	gl518_write_value(client, GL518_REG_MASK, 0x00);
608 
609 	/* Clear status register (D5=1), start (D6=1) */
610 	gl518_write_value(client, GL518_REG_CONF, 0x20 | regvalue);
611 	gl518_write_value(client, GL518_REG_CONF, 0x40 | regvalue);
612 }
613 
gl518_probe(struct i2c_client * client)614 static int gl518_probe(struct i2c_client *client)
615 {
616 	struct device *dev = &client->dev;
617 	struct device *hwmon_dev;
618 	struct gl518_data *data;
619 	int revision;
620 
621 	data = devm_kzalloc(dev, sizeof(struct gl518_data), GFP_KERNEL);
622 	if (!data)
623 		return -ENOMEM;
624 
625 	data->client = client;
626 	revision = gl518_read_value(client, GL518_REG_REVISION);
627 	data->type = revision == 0x80 ? gl518sm_r80 : gl518sm_r00;
628 	mutex_init(&data->update_lock);
629 
630 	/* Initialize the GL518SM chip */
631 	data->alarm_mask = 0xff;
632 	gl518_init_client(client);
633 
634 	/* sysfs hooks */
635 	data->groups[0] = &gl518_group;
636 	if (data->type == gl518sm_r80)
637 		data->groups[1] = &gl518_group_r80;
638 
639 	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
640 							   data, data->groups);
641 	return PTR_ERR_OR_ZERO(hwmon_dev);
642 }
643 
644 static const struct i2c_device_id gl518_id[] = {
645 	{ "gl518sm" },
646 	{ }
647 };
648 MODULE_DEVICE_TABLE(i2c, gl518_id);
649 
650 static struct i2c_driver gl518_driver = {
651 	.class		= I2C_CLASS_HWMON,
652 	.driver = {
653 		.name	= "gl518sm",
654 	},
655 	.probe		= gl518_probe,
656 	.id_table	= gl518_id,
657 	.detect		= gl518_detect,
658 	.address_list	= normal_i2c,
659 };
660 
661 module_i2c_driver(gl518_driver);
662 
663 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
664 	"Kyosti Malkki <kmalkki@cc.hut.fi> and "
665 	"Hong-Gunn Chew <hglinux@gunnet.org>");
666 MODULE_DESCRIPTION("GL518SM driver");
667 MODULE_LICENSE("GPL");
668